1 files changed, 104 insertions, 0 deletions
diff --git a/src/google/protobuf/compiler/cpp/cpp_extension.cc b/src/google/protobuf/compiler/cpp/cpp_extension.cc
new file mode 100644
index 00000000..87da63d7
--- /dev/null
+++ b/src/google/protobuf/compiler/cpp/cpp_extension.cc
@@ -0,0 +1,104 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.
+// http://code.google.com/p/protobuf/
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <google/protobuf/compiler/cpp/cpp_extension.h>
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/io/printer.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace cpp {
+
+ExtensionGenerator::ExtensionGenerator(const FieldDescriptor* descriptor,
+                                       const string& dllexport_decl)
+  : descriptor_(descriptor),
+    dllexport_decl_(dllexport_decl) {
+  // Construct type_traits_.
+  if (descriptor_->is_repeated()) {
+    type_traits_ = "Repeated";
+  }
+
+  switch (descriptor_->cpp_type()) {
+    case FieldDescriptor::CPPTYPE_ENUM:
+      type_traits_.append("EnumTypeTraits< ");
+      type_traits_.append(ClassName(descriptor_->enum_type(), true));
+      type_traits_.append(" >");
+      break;
+    case FieldDescriptor::CPPTYPE_STRING:
+      type_traits_.append("StringTypeTraits");
+      break;
+    case FieldDescriptor::CPPTYPE_MESSAGE:
+      type_traits_.append("MessageTypeTraits< ");
+      type_traits_.append(ClassName(descriptor_->message_type(), true));
+      type_traits_.append(" >");
+      break;
+    default:
+      type_traits_.append("PrimitiveTypeTraits< ");
+      type_traits_.append(PrimitiveTypeName(descriptor_->cpp_type()));
+      type_traits_.append(" >");
+      break;
+  }
+}
+
+ExtensionGenerator::~ExtensionGenerator() {}
+
+void ExtensionGenerator::GenerateDeclaration(io::Printer* printer) {
+  map<string, string> vars;
+  vars["extendee"   ] = ClassName(descriptor_->containing_type(), true);
+  vars["type_traits"] = type_traits_;
+  vars["name"       ] = descriptor_->name();
+
+  // If this is a class member, it needs to be declared "static".  Otherwise,
+  // it needs to be "extern".
+  vars["qualifier"] =
+    (descriptor_->extension_scope() == NULL) ? "extern" : "static";
+
+  if (!dllexport_decl_.empty()) {
+    vars["qualifier"] = dllexport_decl_ + " " + vars["qualifier"];
+  }
+
+  printer->Print(vars,
+    "$qualifier$ ::google::protobuf::internal::ExtensionIdentifier< $extendee$,\n"
+    "  ::google::protobuf::internal::$type_traits$ > $name$;\n");
+}
+
+void ExtensionGenerator::GenerateDefinition(io::Printer* printer) {
+  map<string, string> vars;
+  vars["extendee"   ] = ClassName(descriptor_->containing_type(), true);
+  vars["number"     ] = SimpleItoa(descriptor_->number());
+  vars["type_traits"] = type_traits_;
+  vars["name"       ] = descriptor_->name();
+
+  // If this is a class member, it needs to be declared in its class scope.
+  vars["scope"] = (descriptor_->extension_scope() == NULL) ? "" :
+    ClassName(descriptor_->extension_scope(), false) + "::";
+
+  printer->Print(vars,
+    "::google::protobuf::internal::ExtensionIdentifier< $extendee$,\n"
+    "  ::google::protobuf::internal::$type_traits$ > $scope$$name$($number$);\n");
+}
+
+}  // namespace cpp
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google